Cylindrical device with knives connected thereto

ABSTRACT

A cylindrical device includes semi-helically oriented teeth, knives, or blades radially outward from an outer surface of the cylindrical device or rotor. Each tooth, knife, or blade is part of a row of teeth, knives, or blades. Each row is oriented with an offset angle such that the spirally orientation completes angular offset of about 90° or less. The knives may have sharpened edges that are oriented to cut on different planes as the cylindrical device rotates. The knives may be held in place by holders that have configurations to oriented the knives at certain angles.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 16/135,101, filed on Sep. 19, 208, which claims thebenefit of U.S. Provisional Patent Application Ser. No. 62/562,092,filed Sep. 22, 2017; the entirety of each is incorporated herein byreference.

TECHNICAL FIELD

The present disclosure relates to a land clearing attachment forconnection with a tractor device. More particularly, the land clearingattachment includes a rotor having individual knife blades or teethoriented in a spaced apart manner wound helically about an outer surfaceof the rotor.

BACKGROUND Background Information

Land clearing attachments are known to be useful tools for removing andmulching materials, such as brush or tree stumps. One form of landclearing attachment for a tractor device is a stump grinder. Anotherform of land clearing attachment for a tractor device is a mulcher. Someof these attachments include a rotor that rotates to either grind orcut/mulch materials. However, the manner in which the rotor isconfigured requires the tractor to supply a significant amount of powerto the rotor for the rotor to effectively cut, mulch, or grind thematerials.

SUMMARY

Issues continue to exist with current land clearing attachments. Namely,issues exist with the amount of power needed to be supplied in order toeffectively cut or much materials. Thus, there is a need for a landclearing attachment that can effectively cut or mulch materials in amore efficient manner. The present disclosure addresses these and otherissues.

In accordance with one aspect of the present disclosure, a land clearingattachment is provided that more efficiently cuts or clearsland/materials. The land clearing attachment may include a rotor havingteeth/knives that are in a spiral or semi-spiral arrangement and eachtooth/knife cuts on a different plane to create a point chip cut line.Additionally, the teeth/knives are four-sided so that they can be movedto create a new sharp edge. This is unique to a land clearing attachmentor mulcher tool. The shape of the knife holder is also unique in that itis angled through 3-dimensions to provide a very accurate chip angle.The knife holder is also a wearable and reusable unit. The angle of themounting hole is also angled relative to the angle of the helix that allthe knives are mounted to and it is not perpendicular to the face of thedrum. Instead, it is angled relative to the face of the drum. Itbalances the drum and substantially reduces the horsepower. While othersrequire 100 horsepower on a tool such as this, the unit of the presentdisclosure only requires 50 horsepower. It also keeps the material fromwrapping, as the drum or rotor prevents a double grind of the materialas the material falls away very fast as it is chipped into pieces. Asidefrom cutting stumps and trees, it will also cut grass along the way. Theattachment may be mounted on a 3-point or skid steer style hitch andallow both to be mounted on the same tool as well as a mini excavator.The rotor or drum is formed from about a 1¾ inch thick steel material toadd weight. Therefore, less weight is needed in the machine as theweight of the drum offsets it and even then, the whole machine onlyweighs 900 pounds, whereas most others are approximately 2,500 pounds.

In accordance with one aspect of the present disclosure, an exemplaryembodiment may provide a land clearing attachment comprising: a rotor ordrum having a first end opposite a second end and a cylindrical sidewallextending from the first end to the second end defining an outer surfaceof the rotor, and the rotor adapted to rotate about an axis; a first rowof independent knives connected to the cylindrical sidewall and positionradially outward from the outer surface relative to the axis; whereinthe first row of independent knives is offset at an angle from the firstend to the second end such that the first row of independent kniveswinds semi-helically around the rotor. This embodiment or anotherexemplary embodiment may further provide a holder connected to one knifeand connected to the cylindrical sidewall, wherein the holder ismachined on plane to offset a cutting action of the one knife. Thisembodiment or another exemplary embodiment may further provide at leasttwo edges on each knife, wherein the knife is releasably attached to theholder and adapted to be rotated when one of the edges dulls so theother of the at least two edges becomes a leading cutting edge. Thisembodiment or another exemplary embodiment may further provide a topsurface of the one knife having a first area; a bottom surface of theone knife having a second area less than the first area. This embodimentor another exemplary embodiment may further provide a tapered sidewallextending between the top surface and the bottom surface of the oneknife. This embodiment or another exemplary embodiment may furtherprovide at least two knives in the first row of independent knives,wherein the at least two knives are spaced apart from each other, and aleading edge on each of the at least two knives cuts on a differentplane as the rotor is rotated about the axis. This embodiment or anotherexemplary embodiment may further provide a leading cutting edgepositioned above a bottom surface on each one of the independent knives,wherein the leading cutting edge is adapted chip away material ratherthan pounding away material.

In yet another embodiment, there may be a second row of independentknives connected to the cylindrical sidewall and position radiallyoutward from the outer surface relative to the axis and spaced from thefirst row. Further, the first and second rows spiral about 90° along thelength of the outer surface. In yet another embodiment, there may be athird row of independent knives connected to the cylindrical sidewalland position radially outward from the outer surface relative to theaxis and spaced from the first row and the second row. The first,second, and third rows may spiral about 90° along the length of theouter surface. In yet another embodiment, there may be a fourth row ofindependent knives connected to the cylindrical sidewall and positionradially outward from the outer surface relative to the axis and spacedfrom the first row, the second row, and the third row. The first,second, third, and fourth rows spiral about 90° along the length of theouter surface. In yet another embodiment, there may be a fifth row ofindependent knives connected to the cylindrical sidewall and positionradially outward from the outer surface relative to the axis and spacedfrom the first row, the second row, the third row, and the fourth row.In this instance, the first, second, third, and fourth rows spiral about72° along the length of the outer surface. In yet another embodiment,there may be at least one knife in the first row includes: a top surfacespaced from a bottom surface, wherein the at least one knife is shapedas a generally inverted frusto-square pyramid; and a sidewall extendingbetween the top surface and the bottom surface at angle that tapers in arange from about 30° to about 60°. In yet another embodiment, there mayfour sharpened edges to cut materials during the land clearing ormulching process; and a screw that connects the at least one knife tothe rotor adapted to enable the knife to be rotated 90° about a screwaxis so as to change a leading cutting edge of the knife when onecutting edge becomes dull.

In yet another aspect, an exemplary embodiment of the present disclosuremay provide a rotor for a land clearing attachment comprising: acylindrical sidewall extending from a first end to a second end definingan outer surface adapted to rotate about an axis a first end opposite asecond end and; a plurality of holders coupled to the outer surfacearranged in rows that spiral at least semi-helically around the outersurface from the first end to the second end; at least one knife carriedby each holder having a plurality of cutting edges that may be rotatedwhen one cutting edge become dull. This exemplary embodiment or anotherexemplary embodiment may further provide wherein each holder from theplurality of holders includes: a downwardly concave bottom surface thatis at least partially complementary in curvature to the outer surface; ahole defined by a planar portion of each holder that aligns with a holeformed in the outer surface to enable passing a screw therethrough; anupwardly extending extension protrudes upwardly from the planar portionof each holder and the extension includes a first angled face and asecond angled face that are angled opposite each other and connect witha planar upper portion that is offset parallel to planar portion suchthat the upper portion is positioned vertically above the planarportion; a wearable material at the upper portion to protect each knife;an angle at which the second face intersects planar portion in a rangefrom about 30° to about 60°; wherein each knife includes: four sharpenededges to cut materials during the land clearing or mulching process; atop surface spaced from a bottom surface, wherein the at least one knifeis shaped as a generally inverted frusto-square pyramid; a sidewalldefining one sharpened edge extending between the top surface and thebottom surface at angle that tapers in a range from about 30° to about60°; a countersunk through aperture extending from the top surface tothe bottom surface configured to alight with a hole formed in the rotor;and a screw that connects the at least one knife to the holder andadapted to enable the knife to be rotated 90° about a screw axis so asto change a leading cutting edge of the knife when one cutting edgebecomes dull.

In accordance with one aspect of the present disclosure, an exemplaryembodiment may provide a land clearing attachment for a tractor deviceincludes semi-helically oriented teeth, knives, or blades radiallyoutward from an outer surface of a rotor. Each tooth, knife, or blade ispart of a row of independent teeth, knives, or blades. Each row isoriented with an offset angle such that the spirally orientationcompletes angular offset of about 90° or less. The spiral or helicalorientation of the cutting teeth, knives, or blades enables the power tobe reduced typically required to effectively rotate a similarly sizedrotor.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

A sample embodiment of the disclosure is set forth in the followingdescription, is shown in the drawings and is particularly and distinctlypointed out and set forth in the appended claims. The accompanyingdrawings, which are fully incorporated herein and constitute a part ofthe specification, illustrate various examples, methods, and otherexample embodiments of various aspects of the disclosure. It will beappreciated that the illustrated element boundaries (e.g., boxes, groupsof boxes, or other shapes) in the figures represent one example of theboundaries. One of ordinary skill in the art will appreciate that insome examples one element may be designed as multiple elements or thatmultiple elements may be designed as one element. In some examples, anelement shown as an internal component of another element may beimplemented as an external component and vice versa. Furthermore,elements may not be drawn to scale.

FIG. 1 (FIG. 1) is a perspective view of a land clearing tool inaccordance with the present disclosure.

FIG. 2 (FIG. 2) is a perspective view of a rotor for the land clearingtool in accordance with the present disclosure.

FIG. 3A (FIG. 3A) is a perspective view of a holder for the landclearing tool in accordance with the present disclosure.

FIG. 3B (FIG. 3B) is side elevation view of the holder.

FIG. 3C (FIG. 3C) is a top place view of the holder.

FIG. 4A (FIG. 4A) is a perspective view of a knife for the land clearingattachment in accordance with the present disclosure.

FIG. 4B (FIG. 4B) is a side elevation view of the knife.

FIG. 4C (FIG. 4C) is a top plan view of the knife.

Similar numbers refer to similar parts throughout the drawings.

DETAILED DESCRIPTION

A land clearing attachment (which may be referred to as a mulcher or amulching attachment) for connection with an excavator, skid steer, orother tractor device is shown generally at 10. The mulcher attachment 10includes a housing 12, a rotor 14, a plurality of holders 16, and aplurality of knives 18.

Housing 12 includes a left side and a right side defining a transversedirection therebetween. Housing 12 further includes a forward end and atrailing end defining a longitudinal direction therebetween. Inaddition, housing 12 includes a top opposite a bottom defining avertical direction therebetween. The rear or trailing end of housing 12is constructed with brackets and other connecting mechanisms to attachto a skid steer, an excavator, or other tractor device as one havingordinary skill in the art would understand. In one particularembodiment, housing 12 is implemented in a manner such that the rear endof housing 12 connects with a forward end of the tractor device. Assuch, the land clearing attachment 10 may be referred to as a forwardattachment relative to a tractor device. Housing 12 may include aplurality of sidewalls gears and other mechanisms are retain thateffectuate rotational-to-rotational movement. More particularly, housing12 may retain a plurality of wheels and other connecting mechanisms thatattach to a power takeoff on the tractor device. These wheels areoperatively connected to rotor 14 so as to effectuate rotationalmovement of rotor 14 around a transverse axis. The rotation of the rotor14 about a transverse axis is effectuated by the operable connectionwith the tractor device such that a powering unit on the tractor deviceeffectuates the rotational movement of rotor 14 about a transverse axis.

FIG. 2 depicts rotor 14 including a left end 20 and a right end 22.Rotor 14 includes a substantially rigid cylindrical sidewall 24extending from left end 20 to right end 22. In one particularembodiment, cylindrical sidewall 24 is substantially continuous anduniform in diameter between the left end 20 and the right end 22. Thecylindrical sidewall is concentric with a transverse axis 26 about whichrotor 14 rotates in response to rotational movement of a power takeoffconnector on the tractor device. The diameter of rotor 14 may be in arange from about six inches to about twelve inches. In one particularembodiment, the diameter of rotor 14 is about eight inches. Thecylindrical sidewall 24 of rotor 14 defines a plurality of holestherein. In one particular embodiment, the holes extend radiallyentirely through cylindrical sidewall 24.

Rotor 14 defines a cylindrical central bore 21 that is operablyconnected to housing 12 via a shaft that is concentric about transverseaxis 26. The shaft is removably connected with the rotor 14 so as to bereplaceable without the need for welding the rotor 14 and shafttogether. Further, at least one adjustable cutter bar on housing 12 islocated behind the rotor 14. The adjustable cutter bar is removablyconnected with housing 12 so as to be replaceable when the adjustablecutter bar is worn. Additionally, the adjustable cutter bar preventsmaterial from wrapping around the rotor 14.

In one particular embodiment, rotor 14 has four rows of holes extendingalong the length of rotor 14. Notably, the length of rotor 14 isoriented in the transverse direction relative to housing 12. Moreparticularly, the holes may have semi-helically shaped 90° offset.Stated otherwise, there is a first hole of a first row oriented at atwelve o'clock position, a second hole of a second row oriented at athree o'clock position, a third hole of a third row oriented at a sixo'clock position, and a fourth hole of a fourth row oriented at a nineo'clock position when viewing the rotor 14 from one of the ends. Each ofthe rows of holes helically winds approximately 90° from the left end 20to the right end 22. Stated otherwise, a first row of holes near theleft end 20 wind helically in the counterclockwise direction towards anine o'clock position near the right end 22. In one particularembodiment, the first row of holes begins near a twelve o'clock positionnear the left end 20 and is near a nine o'clock position near the rightend 22. A second row of holes begins near the three o'clock positionnear the left end 20 and helically winds 90° so as to be near the twelveo'clock position near the right end 22. A third row of holes begins nearthe six o'clock position near left end 20 and helically winds about 90°so as to be near the three o'clock position near the right end 22. Thefourth row of holes begins near the nine o'clock position near the leftend 20 and helically winds about 90° so as to be near the six o'clockposition near the right end 22. In this instance, each of the four rowsof holes is defined by about ten radially extending apertures or boresconfigured to receive threaded screw or other removable connectionmember therethrough so as to effectuate the attachment of object to therotor 14.

Each hole in each row may be coupled with a knife or blade 18.Accordingly, each knife 18 is independent since it is spaced apart froman adjoining blade in the row. Inasmuch as each knife 18 is coupled withthe holes, the rotor 14 further includes a first row of knives near theleft end 20 wind helically in the counterclockwise direction towards anine o'clock position near the right end 22. In one particularembodiment, the first row of knives 18 begins near a twelve o'clockposition near the left end 20 and spirals such that the first row ofknives ends near a nine o'clock position near the right end 22. A secondrow of knives begins near the three o'clock position near the left end20 and helically winds about 90° so as to be near the twelve o'clockposition near the right end 22. A third row of knives begins near thesix o'clock position near left end 20 and helically winds about 90° soas to be near the three o'clock position near the right end 22. Thefourth row of knives begins near the nine o'clock position near the leftend 20 and helically winds about 90° so as to be near the six o'clockposition near the right end 22.

In one particular embodiment, the holder 16 is attached to the rotor 14via a screw threaded through one of the radially aligned bores definingthe row of holes. In this instance, there may be a plurality of holdershelically wound about the outer surface of the rotor 14. It isenvisioned that one tool holder attaches with the rotor 14 via one hole.

As depicted in FIG. 3A, FIG. 3B, and FIG. 3C, each holder 16 includes adownwardly concave bottom surface 28 that is at least partiallycomplementary in curvature to the outer surface of cylindrical sidewall24. Each holder 16 includes a hole 30 which is configured to align withthe radially aligned holes in the cylindrical sidewall 24 so as toeffectuate the passage of a screw therethrough. However, the hole 30 maynot be exactly orthogonal to the bottom surface 28, such that the holderis at a slightly angled (non-orthogonal) orientation relative to outersurface 24 of rotor 14. The hole 30 is defined in a planar portion 32 ofthe holder 16. An upwardly extending extension 34 protrudes upwardlyfrom the planar portion 32. Extension 34 includes a first angled face 36and a second angled face 38. Angle faces 36, 38 are angled opposite eachother such that the first angled face 36 faces a first direction and thesecond angled face 38 faces an opposite second direction. The angledfaces connect with a planar upper portion 40 that is offset parallel toplanar portion 32. In one particular embodiment, the upper portion 40 ispositioned vertically above planar portion 32. The holder 16 includes awearable material at the top 40 in order to protect each knife 18. Theangle at which the second face 38 intersects planar portion 32 is in arange from about 30° to about 60°; however, in one particularembodiment, the angle between second face 38 and planar portion 32 isabout 45°. The height of the extension 34 is about 0.35 inches aboveplanar portion 32. Each holder 16 includes a reverse side that ismachined on plane to offset a cutting action of the each blade or knife18. Because the tool holder 16 defines the hole 30 therethrough, it maybe removed from its connection with the rotor 14 so as to be replaceablein the event it becomes worn and needs replaced with a new tool holder16.

Each one of the plurality of knives, or an individual knife 18, includesan upwardly facing top surface 42 spaced from a downwardly facing bottomsurface 44.

Knife 18 is generally an inverted frusto-square pyramidal shape. Statedotherwise, knife 18 is shaped as an inverted truncated right squarepyramid. Top surface 42 is generally square shaped having a firstsurface area. The bottom surface 44 is also square shaped, but has asmaller surface area such that the sidewalls of the teeth/knife 18 angleand taper inwardly from the top surface 42 to the bottom surface 44. Inone particular embodiment, the angle at which the sidewalls of knife 18taper inwardly is in a range from about 30° to about 60°. However, inone particular embodiment, the tapering angle is about 45°. The verticalthickness of the knife 18 is about one-fourth inch to about one-halfinch thick, and in one particular embodiment, it is about 0.35 inches. Avertically aligned central through aperture 46 having a conical counterbore extends fully through the knife 18 from the top surface 42 to thesecond surface 44. Central aperture 46 is configured to align with hole30 on holder 16. More particularly, when the knife 18 and holder 16 areassembled together so as to attach the knife 18 to the rotor 14, thehole 46 is aligned with the hole 30 on holder 16 which is aligned with aplurality of holes defined radially through the cylindrical sidewall 24of rotor 14. Accordingly, screw or bolt or other fastening mechanism maybe utilized to connect the knife 18 and the holder 16 into thecylindrical surface 24 of rotor 14. Inasmuch as the centrally alignedaperture 46 extends fully through each one of the knives 18, the knives18 and holders 16 follow a similar 90° offset helical pattern around theouter surface of cylindrical sidewall 24 of rotor 14 complementary tothe plurality of holes formed by the rows.

Each knife 18 includes four edges, namely, a first edge 48, a secondedge 50, a third edge 52, and a fourth edge 54. Each of the four edgesis sharp and is designed to cut materials during the land clearing ormulching process. Additionally, in accordance with one aspect of thepresent disclosure, the mechanical member, such as the screw, utilizedto secure the knife 18 to the holder 16 may be removed and the knife 18may be rotated 90° about the screw axis so as to change the leadingcutting edge when one of the cutting edges becomes dull.

In accordance with another aspect of the present disclosure, a 90°helical offset of the knives 18 mounted on rotor 14 enables each knifeto cut on a different plane as the rotor 14 rotates about transverseaxis 26. This enables the knives 18 to cut and chip away at the materialto be cleared rather than pounding away the material as isconventionally accomplished in rotary mulchers and stump grinders. Thechipping away of material effectuated by knives 18 reduces the amount ofhorsepower required to do the work. For example, the configuration ofknives 18 in the 90° offset helical manner around the outer surface ofcylindrical sidewall 24 of rotor 14 enables the mulcher attachment 10 tobe powered by at 50 horsepower engine on a tractor device. Incontradistinction to this, conventional mulchers or stump grinderstypically require a minimum horsepower requirement of about 100horsepower for a rotary mulcher attachment. Thus, the assembly,configuration, and structural embodiments of the present disclosureeffectuate and reduce power requirements (i.e., improve efficiency)while still enabling sufficient mulching and cutting of materials to beaccomplished.

The spiraling rows of knives 18 connected thereto reduce vibrations whenrotor 14 is rotating about transverse axis 26. More particularly, thespiraled arrangement of the helically wound tool holder 16 carryingknives 18 helps balance the rotor 14 as it is rotating about transverseaxis 26 so as to reduce vibrations from arrangement fabricated fromlinear rows of holders 16 and knives 18.

In accordance with one aspect of the present disclosure, the number ofrows or knives attached to the outer surface of the rotor 14 may varydepending upon the diameter of the rotor 14. In one example, the rotor14 has a diameter of about eight inches and there are four rows ofhelically wound knives 18 oriented at a 90° offset along the length ofthe rotor 14, however the number of rows of knives 18 may vary. Forexample, it is possible for a larger diameter rotor 14 to have anincreased number of rows of knives thereon. In one implementation, atwelve inch rotor may have five rows of knives winding semi-helicallyalong the length thereof. In this example, when there are five rows, theangle of the offset may be 72°. Stated otherwise, a first knife in a rownear the first end 20 of the twelve-inch diameter rotor 14 may be offset72° from the last knife in the row near the second end 22 of thetwelve-inch diameter rotor 14. In other alternative embodiments, it ispossible as the diameter of the rotor increases to have four rows ofknives 18 thereon, yet the size of the knives would be increased. In oneexample, the knives are about three inches by three inches square whenthe diameter of the rotor is about eight inches. In another example,when the diameter of the rotor 14 is increased, the knives 18 may beincreased in size to be four inches by four inches square or even fiveinches by five inches square.

In accordance with one aspect of the present disclosure, the rotor 14having the geometric and semi-helically wound arrangement of the knivessupported by the holders 16 thereon enable the rotor 14 to chip, chop,cut, and mulch various materials that rotor 14 rotates about transverseaxis 26. In accordance with one aspect of the present disclosure, thehelically wound offset of the knives 18 enables the knives to cutindependently from each other at a different angle relative to thematerial to be chopped. Because each knife acts independently from eachother, less force is needed to chop or cut a small piece of materialcontacting the leading edge of each knife 18. This effectively reducesthe amount of horsepower needed to rotate the rotor 14 about itstransverse axis during the mulching action.

In operation, the rotor 14 is housed within housing 12. The rotor 14 isoriented transverse relative to housing 12 and supported by thereplaceable axis and various other operational rotational assembliesthat effectuate the rotor 14 to rotate about transverse axis 26 which ispowered by a tractor device that supports the housing 12.

When each knife 18 is assembled on each respective holder 16, the angledface 38 and the extension 34 act as a support for the knife 18. Moreparticularly, the angle at which face 38 angles is similar to thetapering angle of knife 18 between the top surface 42 and the bottomsurface 44. Accordingly, the face 38 makes substantial contact with theangled sidewall 24 on knife 18. The upper extension 34 provides asupport in the form of a backstop so as to support the knife during itsrotational action about axis 26.

The leading edge of each knife contacts material in the ground or nearthe ground that is to be cleared or mulched. The orientation of eachknife is independent and spaced from adjacent knives positioned alongthe outer surface of the of the rotor 14. When the leading edge of oneof the knives becomes worn, the screw securing the knife 18 to theholder 16 may be loosened so as to allow the knife 18 to be rotated 90°.After rotating the knife 18, a new leading edge is established which isshaper than the worn/dulled edge. For example, the first edge 48 maybegin as the leading edge. The first edge performs a cutting action bycontacting material as the rotor 14 rotates about axis 26. When firstedge becomes worn or dull, the knife 18 may be rotated by about 90°about an axis of the screw that connects knife 18 to the holder 16 suchthat the second edge 50 becomes the new leading edge. This shouldincrease the useful life of the knife 18 about four-fold compared to aconventional mulching tooth that has only one edge.

Also, various inventive concepts may be embodied as one or more methods,of which an example has been provided. The acts performed as part of themethod may be ordered in any suitable way. Accordingly, embodiments maybe constructed in which acts are performed in an order different thanillustrated, which may include performing some acts simultaneously, eventhough shown as sequential acts in illustrative embodiments.Additionally, any method of performing the present disclosure may occurin a sequence different than those described herein. Accordingly, nosequence of the method should be read as a limitation unless explicitlystated. It is recognizable that performing some of the steps of themethod in a different order could achieve a similar result.

While various inventive embodiments have been described and illustratedherein, those of ordinary skill in the art will readily envision avariety of other means and/or structures for performing the functionand/or obtaining the results and/or one or more of the advantagesdescribed herein, and each of such variations and/or modifications isdeemed to be within the scope of the inventive embodiments describedherein. More generally, those skilled in the art will readily appreciatethat all parameters, dimensions, materials, and configurations describedherein are meant to be exemplary and that the actual parameters,dimensions, materials, and/or configurations will depend upon thespecific application or applications for which the inventive teachingsis/are used. Those skilled in the art will recognize, or be able toascertain using no more than routine experimentation, many equivalentsto the specific inventive embodiments described herein. It is,therefore, to be understood that the foregoing embodiments are presentedby way of example only and that, within the scope of the appended claimsand equivalents thereto, inventive embodiments may be practicedotherwise than as specifically described and claimed. Inventiveembodiments of the present disclosure are directed to each individualfeature, system, article, material, kit, and/or method described herein.In addition, any combination of two or more such features, systems,articles, materials, kits, and/or methods, if such features, systems,articles, materials, kits, and/or methods are not mutually inconsistent,is included within the inventive scope of the present disclosure.

All definitions, as defined and used herein, should be understood tocontrol over dictionary definitions, definitions in documentsincorporated by reference, and/or ordinary meanings of the definedterms.

The articles “a” and “an,” as used herein in the specification and inthe claims, unless clearly indicated to the contrary, should beunderstood to mean “at least one.” The phrase “and/or,” as used hereinin the specification and in the claims (if at all), should be understoodto mean “either or both” of the elements so conjoined, i.e., elementsthat are conjunctively present in some cases and disjunctively presentin other cases. Multiple elements listed with “and/or” should beconstrued in the same fashion, i.e., “one or more” of the elements soconjoined. Other elements may optionally be present other than theelements specifically identified by the “and/or” clause, whether relatedor unrelated to those elements specifically identified. Thus, as anon-limiting example, a reference to “A and/or B”, when used inconjunction with open-ended language such as “comprising” can refer, inone embodiment, to A only (optionally including elements other than B);in another embodiment, to B only (optionally including elements otherthan A); in yet another embodiment, to both A and B (optionallyincluding other elements); etc. As used herein in the specification andin the claims, “or” should be understood to have the same meaning as“and/or” as defined above. For example, when separating items in a list,“or” or “and/or” shall be interpreted as being inclusive, i.e., theinclusion of at least one, but also including more than one, of a numberor list of elements, and, optionally, additional unlisted items. Onlyterms clearly indicated to the contrary, such as “only one of” or“exactly one of,” or, when used in the claims, “consisting of,” willrefer to the inclusion of exactly one element of a number or list ofelements. In general, the term “or” as used herein shall only beinterpreted as indicating exclusive alternatives (i.e. “one or the otherbut not both”) when preceded by terms of exclusivity, such as “either,”“one of,” “only one of,” or “exactly one of.” “Consisting essentiallyof,” when used in the claims, shall have its ordinary meaning as used inthe field of patent law.

As used herein in the specification and in the claims, the phrase “atleast one,” in reference to a list of one or more elements, should beunderstood to mean at least one element selected from any one or more ofthe elements in the list of elements, but not necessarily including atleast one of each and every element specifically listed within the listof elements and not excluding any combinations of elements in the listof elements. This definition also allows that elements may optionally bepresent other than the elements specifically identified within the listof elements to which the phrase “at least one” refers, whether relatedor unrelated to those elements specifically identified. Thus, as anon-limiting example, “at least one of A and B” (or, equivalently, “atleast one of A or B,” or, equivalently “at least one of A and/or B”) canrefer, in one embodiment, to at least one, optionally including morethan one, A, with no B present (and optionally including elements otherthan B); in another embodiment, to at least one, optionally includingmore than one, B, with no A present (and optionally including elementsother than A); in yet another embodiment, to at least one, optionallyincluding more than one, A, and at least one, optionally including morethan one, B (and optionally including other elements); etc.

When a feature or element is herein referred to as being “on” anotherfeature or element, it can be directly on the other feature or elementor intervening features and/or elements may also be present. Incontrast, when a feature or element is referred to as being “directlyon” another feature or element, there are no intervening features orelements present. It will also be understood that, when a feature orelement is referred to as being “connected”, “attached” or “coupled” toanother feature or element, it can be directly connected, attached orcoupled to the other feature or element or intervening features orelements may be present. In contrast, when a feature or element isreferred to as being “directly connected”, “directly attached” or“directly coupled” to another feature or element, there are nointervening features or elements present. Although described or shownwith respect to one embodiment, the features and elements so describedor shown can apply to other embodiments. It will also be appreciated bythose of skill in the art that references to a structure or feature thatis disposed “adjacent” another feature may have portions that overlap orunderlie the adjacent feature

Spatially relative terms, such as “under”, “below”, “lower”, “over”,“upper”, “left”, “right”, and the like, may be used herein for ease ofdescription to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. It will beunderstood that the spatially relative terms are intended to encompassdifferent orientations of the device in use or operation in addition tothe orientation depicted in the figures. For example, if a device in thefigures is inverted, elements described as “under” or “beneath” otherelements or features would then be oriented “over” the other elements orfeatures. Thus, the exemplary term “under” can encompass both anorientation of over and under. The device may be otherwise oriented(rotated 90 degrees or at other orientations) and the spatially relativedescriptors used herein interpreted accordingly. Similarly, the terms“upwardly”, “downwardly”, “vertical”, “horizontal”, “lateral” and thelike are used herein for the purpose of explanation only unlessspecifically indicated otherwise.

Although the terms “first” and “second” (or “third” and so on) may beused herein to describe various features/elements, thesefeatures/elements should not be limited by these terms, unless thecontext indicates otherwise. These terms may be used to distinguish onefeature/element from another feature/element. Thus, a firstfeature/element discussed below could be termed a secondfeature/element, and similarly, a second feature/element discussed belowcould be termed a first feature/element without departing from theteachings of the present invention.

An embodiment is an implementation or example of the present disclosure.Reference in the specification to “an embodiment,” “one embodiment,”“some embodiments,” “one particular embodiment,” or “other embodiments,”or the like, means that a particular feature, structure, orcharacteristic described in connection with the embodiments is includedin at least some embodiments, but not necessarily all embodiments, ofthe invention. The various appearances “an embodiment,” “oneembodiment,” “some embodiments,” “one particular embodiment,” or “otherembodiments,” or the like, are not necessarily all referring to the sameembodiments.

If this specification states a component, feature, structure, orcharacteristic “may”, “might”, or “could” be included, that particularcomponent, feature, structure, or characteristic is not required to beincluded. If the specification or claim refers to “a” or “an” element,that does not mean there is only one of the element. If thespecification or claims refer to “an additional” element, that does notpreclude there being more than one of the additional element.

As used herein in the specification and claims, including as used in theexamples and unless otherwise expressly specified, all numbers may beread as if prefaced by the word “about” or “approximately,” even if theterm does not expressly appear. The phrase “about” or “approximately”may be used when describing magnitude and/or position to indicate thatthe value and/or position described is within a reasonable expectedrange of values and/or positions. For example, a numeric value may havea value that is +/−0.1% of the stated value (or range of values), +/−1%of the stated value (or range of values), +/−2% of the stated value (orrange of values), +/−5% of the stated value (or range of values), +/−10%of the stated value (or range of values), etc. Any numerical rangerecited herein is intended to include all sub-ranges subsumed therein.

In the claims, as well as in the specification above, all transitionalphrases such as “comprising,” “including,” “carrying,” “having,”“containing,” “involving,” “holding,” “composed of,” and the like are tobe understood to be open-ended, i.e., to mean including but not limitedto. Only the transitional phrases “consisting of” and “consistingessentially of” shall be closed or semi-closed transitional phrases,respectively, as set forth in the United States Patent Office Manual ofPatent Examining Procedures.

In the foregoing description, certain terms have been used for brevity,clearness, and understanding. No unnecessary limitations are to beimplied therefrom beyond the requirement of the prior art because suchterms are used for descriptive purposes and are intended to be broadlyconstrued.

Moreover, the description and illustration of various embodiments of thedisclosure are examples and the disclosure is not limited to the exactdetails shown or described.

What is claimed:
 1. A device comprising: a rotor having a first endopposite a second end and a sidewall extending from the first end to thesecond end defining an outer surface, and the rotor adapted to rotateabout an axis; a first row of knives coupled to the sidewall andpositioned radially outward from the outer surface relative to the axis;a first knife in the first row of knives, the first knife including afirst sharpened edge; and a second knife in the first row of knives, thesecond knife including a second sharpened edge; wherein the firstsharpened edge and the second sharpened edge are oriented to cut ondifferent planes as the rotor rotates about the axis.
 2. The device ofclaim 1, further comprising: a helical offset angle relative to the axisthat is defined by the first row of knives winding semi-helically fromadjacent the first end to adjacent the second end around the outersurface of the rotor; wherein the helical offset angle enables the firstsharpened edge and the second sharpened edge to cut on different planesas the rotor rotates about the axis.
 3. The device of claim 1, furthercomprising: a space between the first knife and the second knife,wherein the space effectuates the first knife to be independent from thesecond knife, and wherein independence of the first knife and the secondknife is adapted to permit the first and second knives to cutindependently from each other at different angles relative to materialto be cut or chopped.
 4. The device of claim 1, further comprising: atleast one sharpened edge on every knife in the first row, and all thesharpened edges are oriented to cut along different planes as the rotorrotates about the axis.
 5. The device of claim 1, wherein the firstknife includes: at least two sharpened edges adapted to cut materialsduring land clearing or mulching; a top surface spaced from a bottomsurface, wherein the at least one knife is shaped as a generallyinverted frusto-square pyramid; a tapered sidewall defining onesharpened edge extending between the top surface and the bottom surfaceat angle in a range from about 30° to about 60°; an aperture definedfrom the top surface to the bottom surface configured to align with ahole formed in the rotor; and wherein the at least one knife is adaptedto be moved to change a leading cutting edge of the knife when the onesharpened edge becomes dull.
 6. The device of claim 5, furthercomprising: at least one screw that couples the first knife to the rotorand adapted to enable the knife to be rotated 90° about a screw axisthat extends through the aperture and the hole formed in the rotor toallow the first knife to be rotated about the screw axis to change theleading cutting edge of the first knife when the one sharpened edgebecomes dull.
 7. The device of claim 6, further comprising: wherein theaperture is countersunk relative to the top surface of the first knife;a radially outermost surface on the screw, wherein when the screwextends through the aperture, the radially outermost surface on the atleast one screw is positioned at a radial distance less than or equal tothat of the top surface of the first knife relative to the axis of therotor.
 8. The device of claim 1, further comprising: a first holder thatcouples the first knife to the rotor, wherein the holder includes abottom surface and an aperture formed in the holder through the bottomsurface, wherein the aperture is non-orthogonal to the bottom surfaceand adapted to orient the holder and first knife coupled theretonon-orthogonally relative to the outer surface of the rotor.
 9. Thedevice of claim 1, further comprising: a helical offset angle relativeto the axis that is defined by the first row of knives windingsemi-helically from adjacent the first end to adjacent the second endaround the outer surface of the rotor; and wherein the helical offsetangle is in a range from about 72° to about 90°.
 10. The device of claim1, where the device is a land clearing attachment comprising: a housingincluding a connecting mechanism for connection with a tractor deviceand adapted to enable the tractor device to carry the land clearingattachment; wherein the rotor is rotatably supported by the housing andadapted to be powered by the tractor device.
 11. A device comprising: arotor having a first end opposite a second end and a sidewall extendingfrom the first end to the second end defining an outer surface, and therotor adapted to rotate about an axis; a first row of knives coupled tothe sidewall and positioned radially outward from the outer surfacerelative to the axis; a first knife in the first row of knives, thefirst knife including a first sharpened edge; and a holder that couplesthe first knife to the rotor to offset the first sharpened edge from theouter surface of the rotor.
 12. The device of claim 11, wherein theholder includes: an extension on the holder that is disposed radiallyoutward from an outermost surface of the first knife relative to theaxis about which the rotor is configured to rotate.
 13. The device ofclaim 11, wherein the holder further includes: a bottom surface that isat least partially complementary in curvature to the outer surface ofrotor.
 14. The device of claim 11, wherein the holder further includes:a planar portion that defines an aperture that aligns with a hole formedin the outer surface of the rotor adapted to receive at least one screwtherethrough.
 15. The device of claim 14, wherein the holder furtherincludes: a bottom surface below the planar portion, wherein theaperture extends through the planar portion, wherein a screw axisdefined by the aperture is non-orthogonal to the bottom surface andadapted to orient the first knife non-orthogonal to the outer surface ofthe rotor.
 16. The device of claim 11, wherein the holder furtherincludes: an extension that protrudes radially outward from a planarportion of the holder, and wherein the extension includes a first angledface that connects with an upper portion that is offset from the planarportion such that the upper portion is positioned radially outward fromthe planar portion relative to the axis about which the rotor isconfigured to rotate; and wherein the first knife contacts the planarportion.
 17. The device of claim 16, wherein the holder furtherincludes: wherein the upper portion is offset parallel to the planarportion.
 18. The device of claim 16, wherein the holder furtherincludes: a wearable material at the upper portion adapted to protectthe first knife as the rotor rotates about the axis.
 19. The device ofclaim 16, wherein the holder further includes: a second angled face thatis angled opposite the first angled face.
 20. The device of claim 19,wherein the holder further includes: an angle at which the first angledface intersects the planar portion in a range from about 30° to about60°.